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