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