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