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