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