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