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