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