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