One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,8)(6,9)(7,10)(11,12)(13,15)(14,16)(20,28)(23,29)(26,32)(30,31)(33,34)(35,40)(36,47)(37,41)(38,45)(39,43)(42,44)(46,48) involution — undirected(1,3,7,5)(2,8,10,4)(6,11,14,13)(9,15,16,12)(17,18)(19,24)(20,29)(21,25)(22,27)(23,28)(26,30)(31,32)(33,35,39,46)(34,40,43,48)(36,44,41,38)(37,45,47,42)(17,19)(18,22)(20,26)(21,27)(23,30)(24,25)(28,32)(29,31)(33,36,39,41)(34,37,43,47)(35,44,46,38)(40,45,48,42)(1,4,7,8)(2,3,10,5)(6,12,14,15)(9,11,16,13)(17,20,21,28)(18,23,25,29)(19,26,27,32)(22,30,24,31)(33,34)(35,40)(36,37)(38,42)(39,43)(41,47)(44,45)(46,48)(1,5,7,3)(2,8,10,4)(6,11,14,13)(9,12,16,15)(17,19)(18,24)(20,26)(21,27)(22,25)(23,31)(28,32)(29,30)(33,37)(34,41)(35,45)(36,43)(38,40)(39,47)(42,46)(44,48)(1,6,7,14)(2,9,10,16)(3,11,5,13)(4,12,8,15)(17,18)(19,22)(20,23)(21,25)(24,27)(26,30)(28,29)(31,32)(33,38)(34,42)(35,36)(37,40)(39,44)(41,46)(43,45)(47,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.