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