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