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