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