One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,14)(12,16)(13,15)(17,18)(19,25)(20,23)(21,26)(22,34)(24,27)(28,31)(29,40)(30,32)(33,36)(35,39)(37,41)(38,42)(43,44)(45,47)(46,48) involution — undirected(1,3,5,4)(2,6,8,7)(9,11,13,12)(10,14,15,16)(17,19)(18,25)(20,32)(21,29)(22,31)(23,30)(24,38)(26,40)(27,42)(28,34)(33,47)(35,48)(36,45)(37,44)(39,46)(41,43)(1,3,5,4)(2,7,8,6)(10,15)(14,16)(17,20,23,18)(19,28,30,42)(21,35,36,41)(22,34,24,27)(25,38,32,31)(26,37,33,39)(29,40,45,47)(43,44,48,46)(9,12,13,11)(10,16,15,14)(17,21,23,36)(18,26,20,33)(19,29,30,45)(22,37,24,39)(25,40,32,47)(27,35,34,41)(28,43,42,48)(31,44,38,46)(1,4,5,3)(2,6,8,7)(17,22)(18,27)(20,34)(23,24)(25,32)(26,33)(29,44)(31,38)(37,39)(40,48)(43,47)(45,46)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.