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