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