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