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