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