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