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