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