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