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