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