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