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