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