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