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