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