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