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