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