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