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