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