One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,16)(12,14)(13,15)(17,18)(19,24)(20,26)(21,29)(22,28)(23,25)(27,32)(30,31) involution — undirected(1,2,5,4)(3,7,8,6)(9,11,14,13)(10,15,12,16)(17,19,23,22)(18,24,25,28)(20,29,30,27)(21,31,32,26)(2,4)(6,7)(9,10,14,12)(11,15,13,16)(18,25)(19,22)(26,31)(27,29)(9,10,14,12)(11,16,13,15)(17,20)(18,26)(19,27)(21,28)(22,29)(23,30)(24,32)(25,31)(1,3,5,8)(2,6,4,7)(9,12,14,10)(11,15,13,16)(17,21)(18,27)(19,26)(20,28)(22,31)(23,32)(24,30)(25,29)(1,4,5,2)(3,7,8,6)(9,13,14,11)(10,15,12,16)(17,22,23,19)(18,28,25,24)(20,29,30,27)(21,31,32,26)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.