One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6)(7,8)(9,13)(10,11)(12,16)(14,15)(17,18)(19,20)(25,33)(28,32)(30,36)(34,35)(1,2)(3,4)(21,22,26,24)(23,27,31,29)(25,28,33,32)(30,34,36,35)(6,11)(7,12)(13,18)(14,19)(22,24)(27,29)(28,32)(34,35) involution — undirected(5,7,10,12)(6,8,11,16)(9,14,17,19)(13,15,18,20)(21,23,26,31)(22,27,24,29)(25,30,33,36)(28,34,32,35)(5,8)(6,12)(7,11)(9,15)(10,16)(13,19)(14,18)(17,20)(21,24,26,22)(23,29,31,27)(25,32,33,28)(30,35,36,34)(5,9,10,17)(6,13,11,18)(7,14,12,19)(8,15,16,20)(21,25)(22,28)(23,30)(24,32)(26,33)(27,34)(29,35)(31,36)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.