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