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