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