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