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