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)(17,18,22,24,20,25,21,26)(19,27,30,31,29,23,28,32)(2,7)(3,5)(4,13)(8,10)(9,15)(12,16)(17,19)(18,23)(20,29)(21,28)(22,30)(24,32)(25,27)(26,31) involution — undirected(1,3,6,5)(2,8,10,7)(4,11,13,14)(9,15,16,12)(18,24)(19,28)(21,22)(25,26)(29,30)(31,32)(1,4,6,13)(2,9,10,16)(3,11,5,14)(7,12,8,15)(18,25)(23,27)(24,26)(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.