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