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