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)(11,15)(12,13)(14,16)(18,23)(24,30)(25,26)(31,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,10)(11,14)(12,13)(15,16)(17,18,21,23)(19,24,27,30)(20,26,22,25)(28,32,29,31)(1,4,5,3)(2,6,7,8)(10,13)(14,15)(17,19,21,27)(18,24,23,30)(20,29,22,28)(25,32,26,31)(9,11,12,16)(10,14,13,15)(18,25)(19,27)(20,22)(23,26)(24,31)(30,32)(2,7)(6,8)(17,20,21,22)(18,26,23,25)(19,28,27,29)(24,32,30,31)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.