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