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