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