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