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