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)(15,17)(16,19)(21,22,26,27)(23,30,28,24)(25,29,33,34)(31,36,35,32)(13,14)(15,16)(17,19)(18,20)(22,27)(23,28)(25,33)(32,36) involution — undirected(6,9)(10,12)(13,15,18,17)(14,19,20,16)(21,23,26,28)(22,24,27,30)(25,31,33,35)(29,32,34,36)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,16,18,19)(14,15,20,17)(21,24)(22,28)(23,27)(25,32)(26,30)(29,35)(31,34)(33,36)(5,7,8,11)(6,10,9,12)(13,17,18,15)(14,19,20,16)(21,25)(22,29)(23,31)(24,32)(26,33)(27,34)(28,35)(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.