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