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