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