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