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