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