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