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