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