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