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