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