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