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