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