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