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