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)(21,22,25,26)(23,27,28,24)(5,6,8,10)(7,9,12,11)(13,14,16,18)(15,17,19,20)(21,23,25,28)(22,24,26,27)(5,6)(7,9)(8,10)(11,12)(13,15)(14,17)(16,19)(18,20)(21,22,25,26)(23,27,28,24)(1,2)(3,4)(5,6)(7,9)(8,10)(11,12)(13,14)(15,17)(16,18)(19,20)(21,24)(22,23)(25,27)(26,28) involution — undirected(5,7,8,12)(6,9,10,11)(13,15)(14,17)(16,19)(18,20)(21,22)(23,27)(24,28)(25,26)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.