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