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