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