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