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