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