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