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