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