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