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