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