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