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