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