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