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