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)(12,14)(13,16)(17,18,23,26,22,27,21,28)(19,29,31,39,32,24,33,41)(20,34,35,25,36,42,37,40)(30,44,47,43,46,48,45,38)(2,5)(3,7)(9,11)(10,13)(12,16)(14,15)(17,19)(18,24)(20,30)(21,33)(22,32)(23,31)(25,38)(26,41)(27,29)(28,39)(34,48)(35,47)(36,46)(37,45)(40,43)(42,44) involution — undirected(11,16)(13,15)(17,20)(18,25)(19,30)(21,35)(22,36)(23,37)(24,38)(26,34)(27,40)(28,42)(29,43)(31,45)(32,46)(33,47)(39,44)(41,48) involution — undirected(2,5)(6,8)(10,14)(13,15)(17,21,22,23)(18,26,27,28)(19,31,32,33)(20,35,36,37)(24,39,29,41)(25,34,40,42)(30,45,46,47)(38,44,43,48)(1,3,4,7)(2,6,5,8)(19,32)(24,29)(30,46)(31,33)(38,43)(39,41)(44,48)(45,47)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.