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