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