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