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