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